Bailey becomes desperate as her patient's condition rapidly worsens, causing everyone to work to find the boy an organ donor before it's too late. Meanwhile, Mark finds himself in a compromising position and Crisitina avoids Owen.

Denny:(opening voiceover) I believe in heaven. I also believe in hell. I've never seen either but I believe they exist. They have to exist. Because without a heaven, without a hell, we're all just headed for limbo.

Bailey: Dr. Shepherd?Derek: Dr. Bailey.Bailey: I need you to stop. I need you to put down the scalpel. This man is trying to kill himself and, God forgive me, I need you to let him.

Mark: Little Grey.Lexie: It's not Little Grey. It's Lexie. And I'm sorry that I broke ... that I hurt you. And I'm sorry that you're humiliated. But I'm not going anywhere. I've got a friend who is guarding the door. A good friend. And since no-one is going to be coming in, I'm now going to climb into bed with you and stroke your hair. Because that's what I like to have done for me, when I'm hurt.

Owen: I planned the whole evening, last night. A real date. It was a clear night, one of the five Seattle gets all year. I was going to take you to the West Point Lighthouse and we were going to watch the Northern Lights together. I'd like another chance. I want you to give me another chance.Cristina: You've got some problems. You've got some big problems.Owen: Yeah. Yeah, I do. Will, you go out with me anyway?Cristina: Yes.

Owen: I want to apologize for last night. It was not my intention to arrive in that state.Cristina: You don't have to say anything.Owen: As a rule, if I'm showering with a woman, I do it without my clothes. And if I get in her bed naked, I don't pass out. And if I --Cristina: It's okay.Owen: It's not.Cristina: It's not, but you don't have to talk about it.

Lexie: Oh my God! Are you okay?Mark: No!Lexie: It's bent in the middle. I think you broke it. Mark: Get Torres! Go!

Bailey: Karev, go and get the machine.Alex: What if it's already hooked up to somebody?Arizona: If that somebody has more than sixteen hours to live, then we'll unhook him.

Meredith:(to Derek) I know you don't understamd me. I don't understand me. I wanted to show him compassion. That's why I went. That's the reason. And it was horrible.

Denny:(closing voiceover) Heaven. Hell. Limbo. No one even knows where we're going. Or what's waiting for us when we get there. But the one thing we can say, with absolute certainty, is that there are moments that take us to another place. Moments of Heaven on Earth. And maybe for now, that's all we need to know.

Episode Goofs

Factual Error:

The state of Washington does not have the death penalty and, therefore, has no death row prisoners.

Cultural References

Episode Title: Stairway to Heaven

"Stairway to Heaven" is the title of a song by Led Zeppelin.

Episode References

Season 2, Episode 27: Denny Duquette was Izzie's fiance from season two of Grey's Anatomy. She repeatedly seems his walking throughout the hospital and has conversations with him, even though he passed away in 2x27 "Losing My Religion".

Season 2, Episode 6: Denny asks Izzie if she believes in Heaven. In 2x06, "Into You Like a Train", Bonnie asked the same question of Tom (the two patients impaled on a metal pole). Also, in the season 3 episode "Some Kind of Miracle", Denny and Bonnie know each other in Meredith's afterlife.

Season 5, Episode 8: Denny tells Izzie that he's "Here for her," in episode 5x08 "These Ties That Bind". Izzie finally figures out what he means by that in this episode. He also says it in a couple of other episodes leading up to this one.